/**
 * Atlas Vertical – Theme toggle button
 * Shows moon icon in light mode, sun icon in dark mode.
 */

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  color: var(--color-text);
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s;
}

.theme-toggle:hover {
  border-color: var(--color-text);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.theme-toggle__icon {
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle__icon svg {
  width: 18px;
  height: 18px;
}

/* Light mode: show moon, hide sun */
.theme-toggle__icon--sun {
  display: none;
}

.theme-toggle__icon--moon {
  display: flex;
}

/* Dark mode: show sun, hide moon */
[data-theme="dark"] .theme-toggle__icon--sun {
  display: flex;
}

[data-theme="dark"] .theme-toggle__icon--moon {
  display: none;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle__icon--sun {
    display: flex;
  }

  :root:not([data-theme="light"]) .theme-toggle__icon--moon {
    display: none;
  }
}